Q: A solution contains 0.250 mol of NaCl in 500 mL of water. What is the molar concentration?

$$c = \frac{0.250\,\text{mol}}{0.500\,\text{L}} = 0.500\,\text{mol/L}$$

Q: What is the density of a substance if its mass is 8.00 g and its volume is 2.00 mL?

$$d = \frac{8.00\,\text{g}}{2.00\,\text{mL}} = 4.00\,\text{g/mL}$$

Q: A block has dimensions 10.0 cm × 10.0 cm × 10.0 cm. What is its volume in liters?

$$V = 10.0\,\text{cm} \times 10.0\,\text{cm} \times 10.0\,\text{cm} = 1000\,\text{cm}^3 = 1.00\,\text{L}$$

Q: Which of the following is the correct formula for density?

$$d = \frac{\text{mass}}{\text{volume}}$$

Question 1

Which of the following is an example of a chemical change?

Accepted Answer

Iron rusting when exposed to oxygen

Question 2

Which statement best describes the law of conservation of energy?

Accepted Answer

Energy cannot be created or destroyed, only transformed.

Question 3

A student measures the mass of a sample as 15.02 g, the volume as 213.1 mL, and the temperature as 103.156 °C. When adding these values, how many decimal places should the final answer have?

Accepted Answer

One decimal place

Question 4

Which of the following is a physical property?

Accepted Answer

Boiling point

Question 5

Convert 25 °C to Kelvin. Use the exact conversion factor.

Accepted Answer

$$K = 25 + 273.15 = 298.15$$

Question 6

Which SI prefix corresponds to $$10^{-6}$$?

Accepted Answer

micro

Question 7

A solution contains 0.250 mol of NaCl in 500 mL of water. What is the molar concentration?

Accepted Answer

$$c = \frac{0.250\,	ext{mol}}{0.500\,	ext{L}} = 0.500\,	ext{mol/L}$$

Question 8

Which of the following best describes accuracy?

Accepted Answer

How close a measurement is to the actual value

Question 9

What is the density of a substance if its mass is 8.00 g and its volume is 2.00 mL?

Accepted Answer

$$d = \frac{8.00\,	ext{g}}{2.00\,	ext{mL}} = 4.00\,	ext{g/mL}$$

Question 10

Which derived SI unit is used to measure pressure?

Accepted Answer

Pascal (Pa)

Question 11

A student records the following measurements: 0.00300250 g. How many significant figures are in this value?

Accepted Answer

7

Question 12

Which of the following is an example of a physical change that absorbs energy?

Accepted Answer

Alcohol evaporating from skin

Question 13

Which of the following is NOT a base SI unit?

Accepted Answer

Liter (L)

Question 14

A block has dimensions 10.0 cm × 10.0 cm × 10.0 cm. What is its volume in liters?

Accepted Answer

$$V = 10.0\,	ext{cm} 	imes 10.0\,	ext{cm} 	imes 10.0\,	ext{cm} = 1000\,	ext{cm}^3 = 1.00\,	ext{L}$$

Question 15

Which of the following best describes precision?

Accepted Answer

How close replicate measurements are to each other

Question 16

Which of the following is the correct SI unit for energy?

Accepted Answer

Joule (J)

Question 17

A student multiplies 15.02 × 213.1 × 103.156. The answer is 330177.8049. How should this be reported with the correct number of significant figures?

Accepted Answer

$$3.302 	imes 10^5$

Question 18

Which of the following is a derived SI unit?

Accepted Answer

Pascal (Pa)

Question 19

Which of the following numbers is ambiguous in terms of significant figures?

Accepted Answer

1200

Question 20

Which of the following is the correct formula for density?

Accepted Answer

$$d = \frac{	ext{mass}}{	ext{volume}}$$

Chapter 1: Units of Measurement for Physical and Chemical Change – Study Notes

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